did-you-kno: The Devil’s Kettle waterfalls in Minnesota have one side that pours over a ledge and continues, and another side with a deep hole that vanishes into nowhere. Researchers have poured in dyes, ping pong balls, and logs, but nobody can figure

did-you-kno: The Devil’s Kettle waterfalls in Minnesota have one side that pours over a ledge and continues, and another side with a deep hole that vanishes into nowhere. Researchers have poured in dyes, ping pong balls, and logs, but nobody can figure

tags: コートニー,

from: https://corpxe.tumblr.com/post/125732732810